<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>回顾Object.defineproperty方法</title>
</head>
<body>

    <script>
        let number = 18
        let person = {
            name:'bear',
            sex:'meal'
        }
        Object.defineProperty(person, 'age', {
            // value: 18,
            // enumerable: true, //控制属性是否可以枚举 默认false
            // writable: true, //控制属性是否可以被修改 默认false
            // configurable: true //控制属性是否可以被删除 默认false
            get: function() {
                return number;
            },
            set(value) {
                console.log('修改age， ', value)
            }
        })
        console.log(person)

        console.log(Object.keys(person))
    </script>

    
</body>
</html>